How effective is Pico Toning for removing blemishes?

My face looks dull due to melasma that appeared all summer, so I am looking into Pico Toning laser treatment. I hear that Pico Toning is more effective at destroying pigments than regular toning; typically, how many sessions are needed to see noticeable improvement? I am also concerned about whether my skin might become dry or sensitive after the procedure. I would appreciate it if you could also recommend some aftercare tips.